What's the Most Efficient Way to Count Character or String Occurrences in a String?

Efficient statistical characters or string in the character string

When the number of target characters or string needs to appear in a longer string, developers usually consider multiple methods. Two common methods include the difference in the length of the length of the string using the replace function, or divide the string based on the target character.

However, .NET 3.5 provides a more efficient solution: the count method of Linq. This allows the count in a line of code:

Among them, Source is a string to be searched,// is a character that wants to count.

<code>int count = source.Count(f => f == '/');</code>

Another method is to use the Split method:

Although both of these methods provide a concise alternative, the benchmark test shows that the method of calculating the length difference between the calculation of the REPLACE function is still surprisingly fast. For example, for the string "/once/upon/a/time/", the REPLACE method consumes 12 seconds in iteration at 50,000,000 times, and the Count method takes 19 seconds, and the Split method takes 17 seconds.

<code>int count = source.Split('/').Length - 1;</code>

In the end, developers should choose the most in line with their specific needs and preferences. However, when performance becomes a focus point, the original method of using the replace function is still a feasible and efficient choice.

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